namespace pers {
const int len = 40;
struct person {
  char fname[len];
  char lname[len];
};
void getperson(person &);
void showperson(const person &);
} // namespace pers

namespace debts {
using namespace pers;
struct debt {
  person name;
  double amount;
};
void getdebt(debt &);
void showdebt(const debt &);
double sumdebt(const debt arr[], int n);
} // namespace debts
